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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '838322b2fd40a1bc5324c9abe564d8c27688f7384680aefe2058266d40b4c690' 
  AND token = 'tw3fOcrvREzNT7IoppEyEuS9cExb5ojVHb+8x70ixgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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