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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59fad0ff4c0d299a6f137a17e3b0de2ca08484b4389fe01582a1feadbcf127b4' 
  AND token = 'Q4690VinET+s45ZFY2L1WsnHO+am7ekGRIH58CPkPi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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