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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9756ddea0e405536fe3ec3dc7a6b77dea1f2706987f78481884d8786daa44cf' 
  AND token = '6cx5BulLFypOfmbd4DHnIfBfNk8+hnGGpmiXO46MWyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}