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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe4c0224b3c82e4762218e0a8556bbae62c1719edb88b8cbad97dbbc5990f145' 
  AND token = 'q5c4V9yUrUJxkwYSp/Hvn+9LnGvLPy3AOooinie87ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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