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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86c8c58af853d3af1a8b055849ffbf5aa43d5c74fb82874e263c3e11c124240' 
  AND token = 'PtqHwCq9DpMf6e9a/G2cWd1bfTXYjq8Dm3BQoqkecZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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