SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93af1105e95cbd86cad2e5918fa957642c6798237f9b85e53c64258e3d4294ab' 
  AND token = 'oQCveBIUZoJOWLAYZy7Ho7Pdq2ClPGFUYJomZ7PuSSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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