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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f7b5e2a575dcd7989665d39d318614b4d0d3477383c59d907e99106842aee20' 
  AND token = 'LTWpYvQbqL+nsSv05QYyW29rP7t/UCdERu1F9O+jpt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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