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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f275c8075d3b8d778b99d6ff43501e35d6ec16ce43f83004eda3a4cea78ee52e' 
  AND token = 'lezAqpff0OA15gKNXQzMvveca3UyvDq1j3VdN2obYf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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