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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a662bc15fd363db1d501c73470ccd4d2c9f39ce4b05fa2755ab2363fa759d8e' 
  AND token = 'Y56w8Y7g3a6jW12363sQzgVa/LspxgMlGWok8Dx/+kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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