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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11136d767971eda4ed585506bc8d55fa4cb4d4f0c70dadd8e5b4c533258d107e' 
  AND token = 'gYr+VFnBFY6XAAwkqLOimHSFdKKtQodoiuR5G355O6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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