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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb0335746a23c15c25d1c36ee55a3b2fde50035df1b5583eb9add3f291bdeef' 
  AND token = 'aC9wqwhvjdgPDcHSpVApSdKm4/DkZkPCRsgs4zJT+tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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