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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0e9e5b4329068c466be3b9e11aa09d0ac0e326067099cd1732c4c0bf3eb468c' 
  AND token = 'wTXArB9C5mbpCPhcHYw+ZuMxaOSduI1b43B/4KXzXxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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