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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2847f2d259d24a235cc7ebae19590f757f17c2e0d5ffc1c7cf0f36e5ca976af2' 
  AND token = 'nAyRqRlHd2doR2l/I0ec6/24tbL2CVJattFhpfgwxaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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