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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9524bb51a42d3369e4bfa84ffa4258862a1623d9d7ec036caea2d9fb8c412abe' 
  AND token = '16q5xeElqd2iE0hNP4JJ4mqundYRJd1/pkpkowVvHfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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