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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a0d2c54f211d2f4b9fcb2ba2a73b05955dd4dd1bc4f43361f9f94fe8a2a793' 
  AND token = 'o0+6k6cAj6me6RwuFlhy/9NYjZiJ/bRmmxeN1aTIZ08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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