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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d3afe394a34fe72bb6059b935f0224c7f385296f662ed23af0dfe724398b938' 
  AND token = 'pWvVL7v0vbR2NS607OGT5KB+AdQqG6a4dqMvx4RxY+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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