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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3e7dba8470c791b04c9b6f8f08b1b10db2098224144062fb87aee94c62919ea' 
  AND token = 'FOwKrP0vInHSaaaEssWqkBeZ9f1RZXuFkfIqZ9u9lRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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