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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a38ddfd52b4ee539ef43e76c99c1cc863a09fb80cdc6295924f9eeafac5fe5c' 
  AND token = 'jSCxIMw1H0PzOx01rKbzopfpouQjlD7oTbEX3IHsYcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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