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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9178e35f9732c937dadab5b9b91cb4aadd06efea931b30148a456bd200ed1318' 
  AND token = '9syIKYeD4J6KBY5yZ9C33hkMEgh5byWXzWySyBBp48M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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