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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1e5f0a69a6c22caebab704912e6df392b64cc896c92d6d19978765586a52dba' 
  AND token = 'wl/ErFIPpYv7LNdRcSr9RU71dPGmTUL5PNTMrCObFsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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