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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba38bbd1ee2205754e303cb8335f6b740bb06c12f1878d56f75a896f337aef26' 
  AND token = 'omzF0jkbgpHEivJbJE9OUNWxcPzNwBQN3dH/6+z0SLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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