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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3060f268984bdb90f93c59a5ad9df3934cd818ab5b020ab57c44f865cb4c887d' 
  AND token = 'g5Dh3vTpQBsqJydBSH8kcv3jIi0sbD7erehLmuuTPUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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