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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60d1b5ca2159f2b6ec5704e5cdd1a5c47ed132923c8dd3033238ebeb4f9291a9' 
  AND token = 'VMl+1ScEf8hRfs0m5oRkv+t5pMQXVqWHnNU17yMjCTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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