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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032a50eba3a3c0479a388cbfa04e0befa70e6a380f43ea545e45a44f16795893' 
  AND token = 'rdvjC+mtSxjke5dWDUSuJgSBy2hzNjfN4vK8f/8gE44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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