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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd56aedc7fcbb2ec0aebc56ef34d7af8d18fec1b4d3cbb5ba89767341bf69ff4c' 
  AND token = 'vA7E0YINUS+r7Klt7Hks/BZG8jLnDMu8M1hQu6d4Tpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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