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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c821679a4fd1a1362f377b96cb8e3dc35c3711dc199a62149c437145113270' 
  AND token = '0Xn4/OSOg2DQx6Q4ufo4gxQo7jz4J/Hy+pEmSwSFc2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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