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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ab1f5e3df03a816530e2b0e68b5d68960b69f28cacf35d45e674adb29d8ff1' 
  AND token = 'acQ6vivUt5eblHM5MEXXfKZjTMIfFbNxFI1MIGF7kWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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