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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce1d6800b8fa17a8c993e4e2b5bd1577d0a70de5077996277548426357e41d03' 
  AND token = '2e72Ae4qRw9vYFy81WNGypo2fwrYeaITe6upkMRucqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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