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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '550ea7cfe8551f41a27fcce9227135923251209948a6edeeae03a62aa9e4e191' 
  AND token = 'HgxYt/vBjhQItXtlAk4lQlVtoSk3Jg08Zk/Eqv2bB9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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