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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9cdef6eef50fccfd087e7ad44ed5656ab209cbfb5ee83a79bd98c103dfb5672' 
  AND token = 'D+wtHisyXebcDyCjCkzciUsLCI523SmXh3oTuqkv+UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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