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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08f817d3bae26453f430805969bfbb93d33a12f07bb9074a3b5d84a5198ec59d' 
  AND token = 'yGe6PhmqhZIQMb8dx0cfzzBQFDzt/C05okiNR9uII8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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