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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad492ac0f41c9db7f52fa92c7901d01b30e7b385cb7f3b2f5f2fe4e59eb0649c' 
  AND token = 'LdWkEibtfJ0o2WtlLwJ+6uaHXZGBrLb+v0Dtjzlxljc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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