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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2de9da4858f3a130fc92d16dc9de2ddfa497cd08ecde7b6e1ed8c3a8ff89c1e7' 
  AND token = 'nqnD9oM1K8IKs89UGd86/Ovc4gUefoTMFSWv8E2ZouM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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