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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9aefab4902ee909d3d0fe6e6281a35ee54a5ba24adadf7bfd57f755f682d24e' 
  AND token = 'r2IYbKeI/7W8bughBPn/goKKl/N1VUL5Fgcfq+SiTqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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