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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64fe269d4445c2d5c7af4dea37a0916755eff6f2492303db98622a9dd0cfaf3e' 
  AND token = 'ebA6/AOoDc7WPhL2mgWiYTJMfGY/L43879x7wbQs8JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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