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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3acd1c6ce6ef0fb79e733b8cdebe923dc4fffbb16f0a2d662ae256d79ddbeb0b' 
  AND token = 'BjIosmDSLZ72B87OwdKPXgquJxXFhVMSv07y/Wr9Uh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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