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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1ab95ccdc6b9352ca034ba73d3f08dff9d6c502a09a15a089e5ab36b6aa2f9c' 
  AND token = 'dbttnbxIxP7wzGu58+qdRjOXvmMferYI7NFKfVH0wqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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