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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4db24ce76607db9d61ac928ddc394a1b9947ce7ef95436599b0a5e92b8844bfd' 
  AND token = 'vebxd8E0VrNXiYAn+DLJouf69CCagOb9vBLokKCa/gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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