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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '324902c078d649b6de6b2a87d7e0b44ff90381e747e86bf870c8b2e714e6faa3' 
  AND token = '1B07QMCJ6BS0gV3TIckA/veAI4am8px6BsJAjVSwGII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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