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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '572e3c27f56623dd33522f13b4b565fca926dd030a7d593096820322a63f3c66' 
  AND token = 'iuIwtuHk2DZjeHLODUSFXQGdiQqM3Z5qyOiLxAREh94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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