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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ab03f830a7b8c823184e90eb0aff0880c1798e947ee64bc97e34129bb0092ba' 
  AND token = 'yg+CG6/Ir0gnIPlAkS5cR1ldOwEDovjX4N91vSYmsjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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