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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bae0dcbb3e6dc2e447646ca4a25b566173e1dede8b7b58d5129d42d82a712b7' 
  AND token = 'p89w4b4kyOIqDW4I2Hinsmjf6D1k13CP8kQzZPFSFQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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