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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ffbec86ff4908a88be0d78f767d83d40eeb943a1cdff57f98760a271070d5e' 
  AND token = '3hlIONl9B9OUgB6QD4fpSZ5ULy/JgpaSZzKNxTGUUM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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