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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7af32ebcfa135d3c6bbf3bcec92b2949a19098eb8e2f6fcc138721fd0ec638b0' 
  AND token = '/CcSQU12QaNuwbK634t+vXEQHZSmz9GlilxQJTK6jDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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