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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be520a6774431d657e500e19d45919cddf463c677511ea891ab0f9e7c1c2725e' 
  AND token = '3hS0OPWA61X1dmDsiYNxpaHlJDy2iUFvOUsM1jX/Pz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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