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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72d07d548bb762e1ccfb9feb7a70283084fd2ab381aa997d532b519d9c8caab5' 
  AND token = 'pMBt0uB8h1D7Mvy8Q0dNqDp1wiias7L4b/vP7gl2gSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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