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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95331e80e9ce8d1b3459ca0765a2ca40c6d1b65c260e8f4e68689d79d913026a' 
  AND token = 'rVkODRAyqdlmsYU4LBo2cjXHyA/6yfjhWImN2vqTw1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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