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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89c7d73ebd09067e70789617fa90335a99af9e37e3e3b6597c00f9d284cfc893' 
  AND token = 'tCo2xsn7xelnAKA081+QhRBd1Gyh2wyuBTypUq8cPZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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