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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d2f19b5ad4a389003ea8a4011cd7b084b4ae4c524921a2ec7bb4a3919527f72' 
  AND token = 'd9nhsKbqZq6gf9MTQ2nHftHlW8Ypxt7VchDcb3Z+FNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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