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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c23877f3eac983244a16710f1b521a84065ccd07de78a407af7043c91f0bdfd9' 
  AND token = 'Day5l0evzVuxOAi2Tk9nMPu1sQHjuIOpWWPGJWFIoOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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