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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a85fbb59ff5d9baaca1ac7ec36907074ce80001b7e87d206bccc8a3a8c133e1b' 
  AND token = '4d4dC3+ulv2Wltg4vTl3PSFsKtenwOe17mVnmv+COC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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