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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1aa2a75661165f2508695a35784032f80e64b331308a818f36863901a7672f9' 
  AND token = 'ZZecKsmBDVGLk32UCksxNHskx0AwIbAz1yGJqrxCOIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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