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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2d0799e40ffd840b1c8364070f3d77c269ffa2c7cf6293efe8b00a707b4cf1d' 
  AND token = 'lzqU3J5uDJhkLTUduWSENoi8+DYNRsGjovAbqN7rTLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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