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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6baf25151a2d92e4f785426227a0dcef48550a93c4558667e4df4407f933552b' 
  AND token = 'BMAtHEBAF/4onUwWCyP/8Borh5bQSy7sqvkWFfEhOVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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