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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aedbfcb5ea13f7c0de350aa30ca8965e0110a88861612aba4ff472c45b237451' 
  AND token = 'g7Ka/tMrkNdw/HwLKZaD1glSeC6OLDeELFL++bt5hqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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