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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0942602e492006f4fa7f0ee0b5a182f60c74b9fb7ed711dbd4508cf4d9235ed0' 
  AND token = 'qrNtHXIaawMEydzyAUWC61nzlZWHYfk8j1LMWctjKpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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