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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abcc89e7bbf5664af0de5954db368e853065948c9a66bcde4f3ae0f864bc92cf' 
  AND token = 'NSobfpnWf/Gb7MBPoBIt1ZYhzoyP5psqv789q2k6GgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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