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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ddd5b20d151b2181eb7ae80aa76cb7d040c539c3fec0564311947cc34edc9d' 
  AND token = 'k6xtlVnNzP9NyWK7fU0/xkv5JIW7HchgNRgLHaM215o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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