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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8423a108ab6e7646af86134588ebb9201adf6c43bd10b971d63a9eb8365617be' 
  AND token = '530J5ekL0jCmQzKTHJ7RD1YOWaEJwZZ4Vlr31lwOjWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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